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is a significant concern for physicians. Central% g- M; h" m6 s5 J5 O
precocious puberty (CPP), which is mediated5 q4 M d# h, i) d& \, V, Y
through the hypothalamic pituitary gonadal axis, has8 H' c5 J) W4 l- x$ Z
a higher incidence of organic central nervous system# G# w; k0 ?( Z/ d
lesions in boys.1,2 Virilization in boys, as manifested; f2 e! g1 Z# }: u6 Z0 |& e1 u; n+ G
by enlargement of the penis, development of pubic
7 s. _% M- M4 L4 Y8 o* nhair, and facial acne without enlargement of testi-& ~' S; H5 [9 P+ v' _
cles, suggests peripheral or pseudopuberty.1-3 We
# j* G* h3 f) v' E$ z* Areport a 16-month-old boy who presented with the1 \7 u" D* W, {; L9 ~
enlargement of the phallus and pubic hair develop-
4 S! w3 G4 X+ H* B4 [( T2 fment without testicular enlargement, which was due+ `9 J" i+ k, b
to the unintentional exposure to androgen gel used by8 G) F1 P0 N/ x) l. `8 U0 x- |
the father. The family initially concealed this infor-
& `0 Q4 Z; t% K! |) u- wmation, resulting in an extensive work-up for this
. o8 ~: w8 j% G- _ u( y7 r- m ychild. Given the widespread and easy availability of
, d3 r8 G! Q; e, k: P X( Z6 ptestosterone gel and cream, we believe this is proba-
3 j0 ]* @' e. ^, Xbly more common than the rare case report in the5 j; {* Y" t; z. L* i2 c
literature.4
! E0 J+ f" i! I9 T4 `0 n$ S" X, [Patient Report
6 I. c( B4 J! I' W& x) h+ UA 16-month-old white child was referred to the
1 X. \- x+ r" ]% J9 n4 z! Bendocrine clinic by his pediatrician with the concern
% \0 I& G3 }# J' ~: `2 ]of early sexual development. His mother noticed
$ q( W3 }4 M6 Y5 u% M0 b( ^light colored pubic hair development when he was+ p% e/ V) t8 s9 U( H' C' P
From the 1Division of Pediatric Endocrinology, 2University of
$ `7 b; B0 L& i u' r6 t8 eSouth Alabama Medical Center, Mobile, Alabama.5 @# ?; |) G2 M5 y# n
Address correspondence to: Samar K. Bhowmick, MD, FACE,
$ S# |) U- R) U7 f; KProfessor of Pediatrics, University of South Alabama, College of8 @& J1 a+ p( k# w2 G! h
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
1 n' z4 p7 O3 \- r/ v( J, `9 k* s' Ge-mail: [email protected].
, y- l' O7 @- [. tabout 6 to 7 months old, which progressively became( N2 o6 V9 ]" V" V7 Z
darker. She was also concerned about the enlarge-! w8 w% Y5 G0 o \9 z2 O7 L
ment of his penis and frequent erections. The child+ F- |+ H' V A5 {9 L$ \& ^9 t
was the product of a full-term normal delivery, with
2 O1 X! ?2 ] Q' ^- Na birth weight of 7 lb 14 oz, and birth length of5 j- v0 m/ e( C% y, v6 y- X+ h
20 inches. He was breast-fed throughout the first year
( X6 d/ J. B8 M9 H, y+ Tof life and was still receiving breast milk along with/ }1 ^2 I( D! a! J
solid food. He had no hospitalizations or surgery,
- N% t/ N1 p1 @9 j/ ?# N7 x5 Rand his psychosocial and psychomotor development6 B5 }7 p Y' {% E5 O5 S
was age appropriate., o5 N& g8 @' E1 d# [8 P6 `6 X2 k1 g
The family history was remarkable for the father,0 u4 [- ~( O& V" L. t2 H
who was diagnosed with hypothyroidism at age 16,
7 v; C H6 B5 c( f" i9 w+ I1 ?+ awhich was treated with thyroxine. The father’s
8 G: f5 E4 c% @height was 6 feet, and he went through a somewhat
5 d/ p. U9 B& I' [9 N( iearly puberty and had stopped growing by age 14.+ E% F" _# M* l& T z* _3 t# D
The father denied taking any other medication. The( n' u: y5 B; @
child’s mother was in good health. Her menarche
# P: U! l: C1 m+ o( B* f+ iwas at 11 years of age, and her height was at 5 feet/ G+ Z8 R* X( u9 @* A1 l+ K) ^
5 inches. There was no other family history of pre-5 H8 W# r3 `1 Q6 h2 q7 L
cocious sexual development in the first-degree rela-+ d a) ]/ B/ ^9 M2 b) K0 l
tives. There were no siblings.
+ K0 ]: S% N% GPhysical Examination
p4 u$ Q- Y- G7 o- p: BThe physical examination revealed a very active,
# y& b0 F! N/ d+ q: rplayful, and healthy boy. The vital signs documented
. @9 Y5 W0 D& G& p6 ia blood pressure of 85/50 mm Hg, his length was4 J% T! i, H7 S- u/ V/ F& n
90 cm (>97th percentile), and his weight was 14.4 kg/ p8 l H- r& g& ]1 i6 t2 u: w
(also >97th percentile). The observed yearly growth4 D1 {, ?/ N9 d5 I7 C' F
velocity was 30 cm (12 inches). The examination of
1 L: L2 m; \& m& K8 A/ mthe neck revealed no thyroid enlargement.
3 X8 u2 x9 ?: h7 u" sThe genitourinary examination was remarkable for$ J. ^' u$ H0 N) B0 v
enlargement of the penis, with a stretched length of
' u# }& Y9 M, F- \4 f3 O8 cm and a width of 2 cm. The glans penis was very well1 B3 P, l# K6 o& A* g% w% ^
developed. The pubic hair was Tanner II, mostly around' Y. x1 v S+ c7 G
540
- q1 n5 G5 U& H* r* P: v$ y2 iat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from& X5 [7 A9 N' M6 j
the base of the phallus and was dark and curled. The: S3 |( I6 Q9 V2 S
testicular volume was prepubertal at 2 mL each.' q) R$ a9 E8 ?( n; l& b7 F
The skin was moist and smooth and somewhat
0 H9 ^# \3 V* {7 l" {, z* _2 Moily. No axillary hair was noted. There were no% w5 ^2 l$ z$ C) F, U; v: z2 j
abnormal skin pigmentations or café-au-lait spots.9 H3 P4 o4 H! b4 A% b" p" ^. m
Neurologic evaluation showed deep tendon reflex 2+- l$ V0 u2 q- b2 p3 P
bilateral and symmetrical. There was no suggestion* ?5 A3 o8 M* M' J
of papilledema.
: R: O& L% Q& vLaboratory Evaluation
5 I* k1 l0 j. d$ _1 K+ S1 ]The bone age was consistent with 28 months by
. s8 O$ c* O4 N% P5 |using the standard of Greulich and Pyle at a chrono-
; i" _. D5 _ I9 H2 Qlogic age of 16 months (advanced).5 Chromosomal
5 D) Y! h, _0 B, r& rkaryotype was 46XY. The thyroid function test# v6 `- P( h5 W7 i( [( e0 k
showed a free T4 of 1.69 ng/dL, and thyroid stimu- @0 b0 K3 I8 D, {! \; t
lating hormone level was 1.3 µIU/mL (both normal).# Z' C) W+ ?% v4 C
The concentrations of serum electrolytes, blood9 ^. H+ B' Y7 @4 W4 l) `- x
urea nitrogen, creatinine, and calcium all were1 |1 v X" T0 M" s* |
within normal range for his age. The concentration1 v M. D {& H( S+ j
of serum 17-hydroxyprogesterone was 16 ng/dL
/ U5 V4 Y6 B5 D5 C0 ^; }( s(normal, 3 to 90 ng/dL), androstenedione was 20
4 W6 e8 t& C4 A: Vng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
: [' s9 H9 H# V" k) G: \terone was 38 ng/dL (normal, 50 to 760 ng/dL),+ i. Z( t/ C0 t0 B H/ ?" k
desoxycorticosterone was 4.3 ng/dL (normal, 7 to5 J: Z( q" d- C4 v- ?- Y, f
49ng/dL), 11-desoxycortisol (specific compound S)
3 |+ G5 ^& D7 n1 D8 c, }+ n$ pwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
6 K, n9 _6 c: v3 d% Z4 Etisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total- s- a" j& D) r% V2 \% O
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),$ J" ^: F+ C3 @1 ~+ |
and β-human chorionic gonadotropin was less than
2 `5 ~( k+ N' }$ A4 o2 O5 mIU/mL (normal <5 mIU/mL). Serum follicular, Q' I0 N+ v! W
stimulating hormone and leuteinizing hormone
% X7 D9 O$ e0 `. x `3 E; Bconcentrations were less than 0.05 mIU/mL
! y, s2 r/ N7 P+ i [(prepubertal).
; K! w8 G. F% o1 M& x( _The parents were notified about the laboratory
( u+ F' i$ J4 g8 `* A+ }) \results and were informed that all of the tests were/ ?: A0 [% l5 w/ a2 }6 W7 T
normal except the testosterone level was high. The
9 V, S5 q: b! s/ z9 A& {3 ~follow-up visit was arranged within a few weeks to
/ U7 u9 P+ N/ [$ ?9 @obtain testicular and abdominal sonograms; how-
1 d0 `' {% ?' ]' Iever, the family did not return for 4 months.; A! a) T, r2 O; |( I) t
Physical examination at this time revealed that the3 k& V, O5 C: L$ E; A. I
child had grown 2.5 cm in 4 months and had gained" U: m- e* M. }* O5 s+ O3 E
2 kg of weight. Physical examination remained- o1 Z9 }5 n3 I
unchanged. Surprisingly, the pubic hair almost com-
) t {8 @5 k4 h- a' d5 L/ f& [pletely disappeared except for a few vellous hairs at
% g% A. e b6 b9 o0 W& o: x* G5 tthe base of the phallus. Testicular volume was still 2
7 q5 v# d% u3 SmL, and the size of the penis remained unchanged.2 b* X- b% o1 W2 T& A& U+ X
The mother also said that the boy was no longer hav-' X' G4 q5 N. V' q* v! _+ g" g
ing frequent erections.
& Y! J( D9 L6 i7 A3 DBoth parents were again questioned about use of, j( i/ u; E9 u$ z0 y; H& x" ]
any ointment/creams that they may have applied to
* r1 y9 Y5 @7 F% W; Tthe child’s skin. This time the father admitted the/ ?; K; U4 v2 y% y( W
Topical Testosterone Exposure / Bhowmick et al 541
) w& C2 h' @, Y& Y3 X# Buse of testosterone gel twice daily that he was apply-
" R9 V1 K+ I/ jing over his own shoulders, chest, and back area for2 j B, J3 P! f2 r/ S
a year. The father also revealed he was embarrassed
2 D Z) T1 W9 b1 m: k; ?9 U( Nto disclose that he was using a testosterone gel pre-4 m3 W) }3 Q2 \$ R+ X8 ?
scribed by his family physician for decreased libido, p& F/ x1 x, `7 \0 x9 C
secondary to depression." V. D+ t+ p1 i4 f$ d% K
The child slept in the same bed with parents.
5 ^/ E# d# w. l$ }The father would hug the baby and hold him on his; g+ d3 i8 k& x+ j* M0 L* w
chest for a considerable period of time, causing sig-
) r2 z( G* u* |9 Enificant bare skin contact between baby and father.# Q3 p X/ g+ p9 Q" P$ |; p
The father also admitted that after the phone call,; p; C; Q2 C& y2 D" Z# _; m. g1 T. H6 M6 A
when he learned the testosterone level in the baby7 x# ]2 |5 W% e. N% \
was high, he then read the product information( A4 e6 Q e; h1 |) X Q
packet and concluded that it was most likely the rea-
4 e( V) ]! g, A# F' b; cson for the child’s virilization. At that time, they B8 b8 Y/ L7 k& k, q$ [
decided to put the baby in a separate bed, and the
3 i4 K% O: Q: T3 X. _! M+ dfather was not hugging him with bare skin and had9 P' `# T) M5 S* ~- }" I- N
been using protective clothing. A repeat testosterone1 d" A4 F8 f& S/ y% {$ s) }
test was ordered, but the family did not go to the0 M# s7 }& e K% {4 w
laboratory to obtain the test., X7 O1 t' I6 D
Discussion
5 L+ b" |9 \. D+ ]4 [* yPrecocious puberty in boys is defined as secondary
: Q2 x! P# d. o* esexual development before 9 years of age.1,4. I/ {/ q3 D4 i- M
Precocious puberty is termed as central (true) when
, h, R' P5 U+ p8 y( dit is caused by the premature activation of hypo-: Z o5 d/ {% O' G1 z: G b. O
thalamic pituitary gonadal axis. CPP is more com-/ J; m( v2 f7 T1 d; u5 }4 y: F
mon in girls than in boys.1,3 Most boys with CPP8 E+ F, } Q( B) L( ?& Z7 _! \# l" ^
may have a central nervous system lesion that is/ `' k7 a( P& H% Z) J& D& ~
responsible for the early activation of the hypothal-$ `" g& s& D( Y& W/ t5 E; Z
amic pituitary gonadal axis.1-3 Thus, greater empha-, L0 g; H9 Q2 A O# i Z# Y8 o* a! F, |
sis has been given to neuroradiologic imaging in
4 D, @ w* L$ j/ w8 A' ^boys with precocious puberty. In addition to viril-) j2 {. L$ [' Q( S8 z+ e3 T
ization, the clinical hallmark of CPP is the symmet-" b* ` H$ ], @+ m
rical testicular growth secondary to stimulation by
7 r: K0 r6 u( S, m8 agonadotropins.1,3
: u' c' b, V+ }Gonadotropin-independent peripheral preco-3 v% G, Q( b* Z+ P* ?
cious puberty in boys also results from inappropriate0 z i$ N8 k" M0 J
androgenic stimulation from either endogenous or
4 r9 L. @& p+ f$ z S+ t2 Y4 oexogenous sources, nonpituitary gonadotropin stim-
1 t& Z9 q' ^4 B- \' ~ulation, and rare activating mutations.3 Virilizing+ W6 X2 W6 ~0 a& O A2 p. ~, Z z1 K
congenital adrenal hyperplasia producing excessive% c$ d# s' q: l/ n
adrenal androgens is a common cause of precocious+ ^, Y0 K( ~& |5 S4 g( O: R
puberty in boys.3,43 _$ T- ?- ~; H( E, `4 M1 |
The most common form of congenital adrenal
( {# a2 f- O. N; ?hyperplasia is the 21-hydroxylase enzyme deficiency.' j- u4 u8 h! x
The 11-β hydroxylase deficiency may also result in& ^ t& t; Q) I' S x8 S4 b" _+ p: Y
excessive adrenal androgen production, and rarely,( d+ l% B2 h: O
an adrenal tumor may also cause adrenal androgen) B, m7 S5 [ \1 E* I8 O6 I. w
excess.1,36 ?* E' O* f9 J$ C
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
! c+ Y: \) H$ Y, P542 Clinical Pediatrics / Vol. 46, No. 6, July 2007, W @5 I/ U3 d5 F# z
A unique entity of male-limited gonadotropin-3 d* n' M J/ g" M0 c. m% A9 r- q
independent precocious puberty, which is also known# F# D/ A; X$ O" m; M5 D Z+ b/ ]0 T
as testotoxicosis, may cause precocious puberty at a
: G4 ~/ _! k$ cvery young age. The physical findings in these boys P$ d6 w1 C- F
with this disorder are full pubertal development,8 o7 W. V* {) T, z
including bilateral testicular growth, similar to boys
- @ O( T0 |- ^, owith CPP. The gonadotropin levels in this disorder
: }' j9 g% }$ Q0 ~are suppressed to prepubertal levels and do not show$ m" u- j7 A4 {; `5 {7 Q$ I
pubertal response of gonadotropin after gonadotropin-
; f6 I* f5 L' [) W1 T5 xreleasing hormone stimulation. This is a sex-linked
4 {1 p. U5 y _. {) r" F5 s; K& nautosomal dominant disorder that affects only
$ T$ i3 R1 B( n" Dmales; therefore, other male members of the family
6 x) z' B" H( B; i( Y* y" dmay have similar precocious puberty.3
; Y4 x& L+ V' TIn our patient, physical examination was incon-
& @% b! J2 k) P7 Ssistent with true precocious puberty since his testi-
! P$ C1 U! v8 o" ]1 F' G+ ^cles were prepubertal in size. However, testotoxicosis$ I. S6 D8 Y% l0 s8 M. H4 k
was in the differential diagnosis because his father6 P- I3 ^. L( w9 N; ?1 |
started puberty somewhat early, and occasionally,6 ^7 @5 O9 p8 W; L% E) `( V
testicular enlargement is not that evident in the( k% v1 N) W0 A- ~
beginning of this process.1 In the absence of a neg-' E$ \' X9 _5 P7 E9 X& u
ative initial history of androgen exposure, our& g% T; n! }% E9 u' q6 X
biggest concern was virilizing adrenal hyperplasia,
# V" b1 f) T8 e/ D% ?) seither 21-hydroxylase deficiency or 11-β hydroxylase) @. `+ W7 e5 Z6 F2 O
deficiency. Those diagnoses were excluded by find-6 \7 ~( b' D7 Y6 Y1 |: F$ B0 N+ S
ing the normal level of adrenal steroids.) ^$ H% l1 Q% M' @& V
The diagnosis of exogenous androgens was strongly
5 y/ ~$ P: T6 Asuspected in a follow-up visit after 4 months because
# E( o; t# c' q+ k( \! ^the physical examination revealed the complete disap-
x7 F" p1 N" G) n+ q) npearance of pubic hair, normal growth velocity, and
% d- S5 b' C1 f+ \4 T( u9 I idecreased erections. The father admitted using a testos-( d' r6 @6 S# E6 d0 g2 o
terone gel, which he concealed at first visit. He was! O7 n( {1 e! [' h
using it rather frequently, twice a day. The Physicians’
9 _+ H! y1 B; k. w# V- qDesk Reference, or package insert of this product, gel or
/ o$ @0 k5 k% C4 Ycream, cautions about dermal testosterone transfer to
2 T0 g. |7 A) N% T2 Zunprotected females through direct skin exposure.- \. u0 E9 s& k) x$ G& G- W q0 u" P
Serum testosterone level was found to be 2 times the
1 M9 n8 d1 G- G9 w) D8 I8 C% ebaseline value in those females who were exposed to
2 h r! v1 O: N5 E9 H% Neven 15 minutes of direct skin contact with their male
/ t( O/ Y8 v3 bpartners.6 However, when a shirt covered the applica-9 O% J3 j, _" ~" C$ S; j* D$ h L
tion site, this testosterone transfer was prevented. Q( ^/ g1 N4 ]3 _+ Y9 U- _- D
Our patient’s testosterone level was 60 ng/mL,
# N3 Q; w3 z0 z3 mwhich was clearly high. Some studies suggest that* t6 P( z6 `! ~) s' z0 p
dermal conversion of testosterone to dihydrotestos-& E! W- J; H* g% p
terone, which is a more potent metabolite, is more
5 c& D/ k5 f+ ?- Uactive in young children exposed to testosterone# _* Q$ D7 _0 T3 G/ y# r+ o$ r
exogenously7; however, we did not measure a dihy-
/ o- I# v! h( p' K; Qdrotestosterone level in our patient. In addition to
" o4 [ ]( m$ ]virilization, exposure to exogenous testosterone in
0 e( q# z5 e4 M- c. D9 l- Lchildren results in an increase in growth velocity and: b* n; ^8 Q h, b+ L: D4 G5 V- L2 t
advanced bone age, as seen in our patient.3 q4 ^1 D/ D& \
The long-term effect of androgen exposure during8 h, ]6 e P+ k# e" M9 K
early childhood on pubertal development and final' ?9 a. v* A7 F; A
adult height are not fully known and always remain u5 [ Y. G4 F, }( {
a concern. Children treated with short-term testos-
3 j8 \# ?- ?! R/ r- v: @! j0 Tterone injection or topical androgen may exhibit some
+ T5 V! d4 z/ L9 n& W7 dacceleration of the skeletal maturation; however, after4 M. I; |) z9 b+ k
cessation of treatment, the rate of bone maturation
' h$ ^; u% E% z4 A& @8 p' R" {( Tdecelerates and gradually returns to normal.8,9; k- ^: }7 C2 V1 f. E% y6 W; N) L
There are conflicting reports and controversy
9 Z6 P, T0 q7 f! Qover the effect of early androgen exposure on adult
% i" {+ F! a2 l# b" w- T Z; i/ zpenile length.10,11 Some reports suggest subnormal, ^8 @$ h$ `6 _: U/ o9 m- x1 B. ~& ~
adult penile length, apparently because of downreg-+ V( `- S2 A' V2 f6 Q
ulation of androgen receptor number.10,12 However,
& }! j! o7 d. i! @; b' k' JSutherland et al13 did not find a correlation between. f ~ ]9 g. v/ F! N
childhood testosterone exposure and reduced adult) Q6 g7 K, p! L! ^$ V
penile length in clinical studies.
+ i# m: g t8 d. @' \7 G; @: fNonetheless, we do not believe our patient is5 T) y: X: b' F
going to experience any of the untoward effects from
& x, X6 F# \' D/ vtestosterone exposure as mentioned earlier because, ^; y( l$ n. d" k% g X. p
the exposure was not for a prolonged period of time.
4 d% P7 @+ K* E ?' v% cAlthough the bone age was advanced at the time of, A/ n3 ~/ f. o% a+ M: f$ S# b
diagnosis, the child had a normal growth velocity at5 l* o* ~' t% Y( K, X
the follow-up visit. It is hoped that his final adult. ?& ?: v! [9 ?/ L& [% w3 f# A
height will not be affected.
3 d; Y$ M5 Y& {6 w2 h Q3 sAlthough rarely reported, the widespread avail- ^/ O3 _) ?7 f2 K
ability of androgen products in our society may
7 E: V' j" c$ ^1 ~; n+ Yindeed cause more virilization in male or female
" k8 U" T5 n7 H% e* ~ pchildren than one would realize. Exposure to andro-
: W# S( v) |4 l' h' q& Egen products must be considered and specific ques-- s" a- ]& x7 R$ E8 S& t
tioning about the use of a testosterone product or
. x; l8 A6 k6 D! \' K0 J+ Y4 jgel should be asked of the family members during; H' I% o' V. y8 I
the evaluation of any children who present with vir- ]0 {" c, f0 K+ T- _
ilization or peripheral precocious puberty. The diag-! Z/ E+ Z2 U/ y# J8 @
nosis can be established by just a few tests and by! r! I/ r: e0 u$ c) g% A5 ?% \8 u' i
appropriate history. The inability to obtain such a, k# Z6 j8 B6 d1 |0 r
history, or failure to ask the specific questions, may
9 G6 N! e" X6 d- E! dresult in extensive, unnecessary, and expensive
2 E. F: ]: |6 U9 oinvestigation. The primary care physician should be
# z* r' N- v7 daware of this fact, because most of these children
- J9 t6 m% @/ D6 hmay initially present in their practice. The Physicians’" g# i; B1 q9 r
Desk Reference and package insert should also put a( f8 Z$ ~% p3 K1 N$ I g
warning about the virilizing effect on a male or# b9 }1 M" R; a, _2 K- e0 J7 s
female child who might come in contact with some-
4 v% B1 f' U; I" ?$ o+ Eone using any of these products., B2 {) `9 W4 p" a: ]
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